Strange... you should have auto-spawned back into the fight. During boss battles the player should not be able to fall off the edge without being re-teleported into the fight.

If you reload the previous checkpoint to redo the fight what happens?

Re. Auto-teleporting, no that’s not what happened with the octopus fight. I fell all the way down to the bottom of the tower. I was not able to teleport back up, since the teleport function was disabled (presumably because the game thought I was in the middle of a boss fight). Having subsequently reloaded the previous checkpoint, I was then able to teleport back up the tower and navigate to where the octopus fight occurs, but there was no activity (no characters, no octopus) on the bottom circular area where the octopus first appears, and the lift up to the next level was not operational.

Hi!The same thing happens to me. I fell from the third floor above one checkpoint, and now the elevator on the first floor doesn't work and the Dr. and his pet are missing.Please help. I want kill Dr. Schopenstein!!!

I've been checking to see if this was reported before and if it was addressed during the time the game launched (Deadly Tower was released on January).

The issue was only reported on PC at the time and was fixed there / then, but not for PS4 (since the issue apparently didn't happen on the console build). With the increased volume of people playing the Playstation 4 version (due to PS+) it now seems clear that the bug is rare but is present in the console build.

If reloading to a previous checkpoint isn't a solution I'm very sorry to say that you've reached a non-progression which has no solution and we need to see about the possibility of patching the PS4 build. Unfortunately that won't be a fast or easy thing to do since we need to coordinate with our publisher and Sony to go through a certification process for a game that was launched months ago.

This is sadly the double edged sword of console development - the certification process means the game is tested to make sure everything is ok for launch, however if something like this gets past the QA team and we get to learn about it 8 months later, we cannot quickly fix this. (On PC I'd have a fix uploaded today... for consoles I simply can't do that.)